2109205 has 12 divisors (see below), whose sum is σ = 2944620. Its totient is φ = 1446144.

The previous prime is 2109203. The next prime is 2109223. The reversal of 2109205 is 5029012.

It can be written as a sum of positive squares in 2 ways, for example, as 625681 + 1483524 = 791^2 + 1218^2 .

It is not a de Polignac number, because 2109205 - 2¹ = 2109203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2109203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4060 + ... + 4549.

It is an arithmetic number, because the mean of its divisors is an integer number (245385).

2^2109205 is an apocalyptic number.

It is an amenable number.

2109205 is a deficient number, since it is larger than the sum of its proper divisors (835415).

2109205 is an equidigital number, since it uses as much as digits as its factorization.

2109205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8628 (or 8621 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 2109205 is about 1452.3102285669. The cubic root of 2109205 is about 128.2447506233.

It can be divided in two parts, 210920 and 5, that added together give a triangular number (210925 = T₆₄₉).

The spelling of 2109205 in words is "two million, one hundred nine thousand, two hundred five".